Correction of Immaterial Errors - Schedule of Effect of the Correction (Parenthetical) (Details)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
North Asia [Member] \| Revenues [Member] \| Revision of Prior Period, Error Correction, Adjustment [Member] \| Geographic Concentration Risk
Error Corrections And Prior Period Adjustments Immaterial Corrections [Line Items]
Concentration percentage	78.00%	73.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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